Snails and slugs will eat almost any kind of plant. Look for them at the bases of leaves of plants, in moist cool areas, or under debris, boards, and flowerpots. snails and slugs leave a shiny slime trail on leaves or soil.

Less Toxic Controls:

Hand pick and crush or drop into soapy water. Hunt at night between 10 pm and 11 pm with a flashlight or, in daylight, look in smooth, dry, dark hiding places. Remove pearl-like egg clusters to reduce populations. If you use commercial baits, place them in a covered container such as a plastic margarine tub, and cut a hole for the snail/slug's entrance. Set out traps such as overturned flower pots or plastic garbage bags laid on the soil or on groundcovers. Check in morning.

Prevention:
Ground beetles, found in compost, will eat slugs an snails.
Remove garden debris (loose boards, old pots, etc.) unless you're using them as traps. Remove or reduce the area of favored breeding sites such as ivy, nasturtiums, and clumps of iris. Install a band of copper sheeting (available at nurseries) around tree trunks, flower pots, or planters.
Dry sawdust paths will deter snails and slugs. Hope this information helps you rid your garden of the pesky pests!